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FI127864B - Electrostatic precipitator and its use - Google Patents

Electrostatic precipitator and its use Download PDF

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Publication number
FI127864B
FI127864B FI20166023A FI20166023A FI127864B FI 127864 B FI127864 B FI 127864B FI 20166023 A FI20166023 A FI 20166023A FI 20166023 A FI20166023 A FI 20166023A FI 127864 B FI127864 B FI 127864B
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FI
Finland
Prior art keywords
electrical
electric
electrostatic precipitator
field
electrodes
Prior art date
Application number
FI20166023A
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Finnish (fi)
Swedish (sv)
Other versions
FI20166023L (en
Inventor
Juha Tolvanen
Original Assignee
Valmet Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to FI20166023A priority Critical patent/FI127864B/en
Priority to CA2985468A priority patent/CA2985468C/en
Priority to BR102017025478-0A priority patent/BR102017025478B1/en
Priority to US15/842,439 priority patent/US10751729B2/en
Priority to CL2017003265A priority patent/CL2017003265A1/en
Priority to CN201711385219.8A priority patent/CN108212536A/en
Priority to EP17209811.3A priority patent/EP3338894A1/en
Publication of FI20166023L publication Critical patent/FI20166023L/en
Application granted granted Critical
Publication of FI127864B publication Critical patent/FI127864B/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/025—Combinations of electrostatic separators, e.g. in parallel or in series, stacked separators or dry-wet separator combinations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/66—Applications of electricity supply techniques
    • B03C3/68—Control systems therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/013—Conditioning by chemical additives, e.g. with SO3

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Separation (AREA)

Abstract

An electrostatic precipitator for removing particulates from boiler flue gas, the electrostatic precipitator comprising: discharge electrodes and collecting electrodes fitted in a gas passage, said electrodes being arranged in at least two electrical fields that are placed successively in relation to gas flow, the electrical field establishing at least one electrical unit in transversal direction of said gas passage, the electrical unit constituting a portion of the precipitator having ability to be de-energised independently, separately from the other electrical units of the electrostatic precipitator. The first electrical field of said at last two electrical fields is arranged to be first in said gas flow. The first electrical field comprises more electrical units than a second field following said first field.

Description

20166023 prh 12 -03- 2019
Electrostatic precipitator and its use
Background
The invention relates to an electrostatic precipitator for removing particulates from boiler flue gas, the electrostatic precipitator comprising dis5 charge electrodes and collecting electrodes fitted in a gas passage, said electrodes being arranged in at least two electrical fields that are placed successively in relation to gas flow, the electrical field establishing at least one electrical unit in transversal direction of said gas passage, the electrical unit constituting a portion of the precipitator having ability to be de-energised inde10 pendently, separately from the other electrical units of the electrostatic precipitator, the first electrical field of said at last two electrical fields arranged to be first in said gas flow.
Electrostatic precipitators use electrical fields to remove particulates from gas streams, such as boiler flue gas, e.g. of chemical recovery boiler, e.g.
black liquor recovery boiler or kraft recovery boiler. Precipitators electrically charge particulates to be removed from gases, and tend not to otherwise affect the gases. Electrostatic precipitators typically have low pressure drops, energy requirements and operating costs.
In an electrostatic precipitator, an intense electric field is maintained 20 between high-voltage discharge electrodes. A corona discharge from the discharge electrodes ionizes the flue gas passing between the collecting electrodes. The ionized gas ionizes fly ash and other particles in the flue gas. The electric field between the discharge electrodes and collecting electrodes drives the negatively charged particles to the collecting electrodes. Periodically, the 25 collecting electrodes are rapped mechanically (in dry electrostatic precipitators) or washed (in wet electrostatic precipitators) to dislodge the collected particles, which fall into hoppers for removal.
Document EP 1967276 discloses a method of controlling the rapping of at least one collecting electrode plate of an electrostatic precipitator.
Document GB 2447125 discloses an electrostatic precipitator. The electrostatic precipitator includes at least one collecting electrode in a gas passage, at least one discharge electrode in the gas passage and separated by a gap from the at least one collecting electrode and a power supply applying a voltage to the discharge electrode.
20166023 prh 12 -03- 2019
Document US 2006137528 discloses an electrostatic precipitator having a plurality of electrostatic precipitation units positioned within the electrostatic precipitator.
Document CN 102631990 discloses a method for efficiently catch5 ing nanometer micro-particles and a device for realizing the method.
A problem with the electrostatic precipitators is that sparking can occur between the discharge and collecting electrodes. Sparking limits the electrical energization of the electrostatic precipitator. Sparking occurs when the ionized gas in the precipitator has a localized breakdown such that current 10 rises rapidly and voltage drops between one or more electrodes. During spark the current can reach over normal operating current. Spark between electrodes create a current path disrupts an otherwise even distribution of current in the electrical field between the electrodes. Sparking can damage internal the electrodes and other components of an electrostatic precipitator.
As a solution to the above-mentioned problem, it is common practice to split the electrostatic precipitator into separate electrical units, both in the width and length, and to energize each section with its own electrical equipment, the electrical unit having thus ability to be de-energised independently, separately from the other electrical units.
This solution has, however, the problem that it has complicated structure, thus being expensive to erect and maintain.
Brief description
Viewed from a first aspect, there can be provided an electrostatic precipitator for removing particulates from boiler flue gas, the electrostatic pre25 cipitator comprising discharge electrodes and collecting electrodes fitted in a gas passage, said electrodes being arranged in at least two electrical fields that are placed successively in relation to gas flow, the electrical field establishing at least one electrical unit in transversal direction of said gas passage, the electrical unit constituting a portion of the precipitator having ability to be 30 de-energised independently, separately from the other electrical units of the electrostatic precipitator, the first electrical field of said at last two electrical fields arranged to be first in said gas flow, wherein the first electrical field comprises more electrical units than a second field following said first field.
Thereby a simple and inexpensive electrical precipitator may be 35 achieved.
20166023 prh 12 -03- 2019
The electrical precipitator is characterised by what is stated in the characterising part of the independent claim. Some other embodiments are characterised by what is stated in the other claims. Inventive embodiments are also disclosed in the specification and drawings of this patent application. The 5 inventive content of the patent application may also be defined in other ways than defined in the following claims. The inventive content may also be formed of several separate inventions, especially if the invention is examined in the light of expressed or implicit sub-tasks or in view of obtained benefits or benefit groups. Some of the definitions contained in the following claims may then be 10 unnecessary in view of the separate inventive ideas. Features of the different embodiments of the invention may, within the scope of the basic inventive idea, be applied to other embodiments.
Brief description of figures
Some embodiments illustrating the present disclosure are described 15 in more detail in the attached drawings, in which
Figure 1a is a schematic side view of a prior art solution of an electrostatic precipitator from above,
Figure 1 b is a schematic perspective view of the electrostatic precipitator shown in Figure 1a,
Figure 2a is a schematic top view of an electrostatic precipitator,
Figure 2b a schematic perspective view of the electrostatic precipitator shown in Figure 2a,
Figure 3a is a schematic top view of another electrostatic precipitator, and
Figure 3b a schematic perspective view of the electrostatic precipitator shown in Figure 3a.
In the figures, some embodiments are shown simplified for the sake of clarity. Similar parts are marked with the same reference numbers in the figures.
Detailed description
Figure 1 is a schematic side view of a prior art solution of an electrostatic precipitator from above, and Figure 1b is a schematic perspective view of the electrostatic precipitator shown in Figure 1a.
The electrostatic precipitator 100 comprises discharge electrodes 1 35 and collecting electrodes 2 fitted in a gas passage 3. The electrodes 1, 2 are
20166023 prh 12 -03- 2019 arranged in three electrical fields 4a, 4b, 4c that are placed successively in relation to gas flow G.
Each of the electrical fields 4a, 4b, 4c establishes two electrical units 5a, 5b arranged in transversal direction of the gas passage 3.
The electrical unit 5a, 5b constitutes a portion of the electrostatic precipitator 100 that has ability to be de-energised independently, separately from the other electrical units 5a, 5b of said electrostatic precipitator 100.
Figure 2a is a schematic top view of an electrostatic precipitator according to the invention, and Figure 2b a schematic perspective view of the 10 electrostatic precipitator shown in Figure 2a.
The electrostatic precipitator 100 comprises discharge electrodes 1 and collecting electrodes 2 arranged in at least two electrical fields that are placed successively in relation to gas flow G in a gas passage 3. The embodiment shown here comprises three electrical fields 4a, 4b, 4c. It is to be noted, 15 however, that the number of the electrical fields may vary from two to eight, or even to higher numbers.
The electrical fields 4a, 4b, 4c establish at least one electrical unit in transversal direction of the gas passage 3. In the embodiment shown in Figures 2a, 2b, the first electrical field 4a comprises two electrical units 5a, 5b, 20 whereas each of second and third fields 4b, 4c following said first field comprises one electrical unit 5 only. In other words, in the first electrical field 4a the cross section of the gas passage 3 has divided in two electrical units 5a, 5b, but there is no such division in the second and third electrical fields 4b, 4c. Thus, the gas flow G flowing through the first electrical field 4a flows through 25 the two electrical units 5a, 5b, and then through one electrical unit 5 in the second electrical field 4b and finally through one electrical unit 5 in the third electrical field 4c.
In the electrical unit 5, 5a, 5b there is maintained an intense electric field between high-voltage discharge electrodes, typically wires, bars or rigid 30 frames, and grounded collecting electrodes, typically parallel plates arranged vertically.
The gas flow G flows through the through a gap between the discharge electrode and the collecting electrode, whereby the gas is ionized by the voltage potential. Particulates contained by the gas are charged and col35 lected on the collecting electrode to remove the particulates from the gas.
20166023 prh 12 -03- 2019
In another embodiment, it is arranged three electrical units (5a, 5b, 5c), or even more electrodes, in the first electrical field 4a, and only one electrical unit 5 in each of the second electrical field 4b and further electrical field(s), if any.
Generally speaking, if the number of the electrical units in the first electrical field 4a is marked as “X“, then the maximum number of the electrical units in the second electrical field 4b is “X - 1” (X subtracted by 1).
Sparks between electrodes create a current path that disrupts an otherwise even distribution of current in the electric field between electrodes.
Sparking can damage internal the electrodes and other components of an electrostatic precipitator.
The first electrical field 4a receives the gas flow G, and thus at least practically all the particles contained by the gas, while the second electrical field 4b, and further electrical fields, if any, receive gas flow that has passed 15 the first electrical filed 4a and comprises thus substantially lowered particle content. Therefore, sparkling takes place most frequently in the first electrical field 4a. According to an experiment made by the inventor, the sparkling rate,
i.e. number of sparks per minute (spm) was 200 - 300 spm in the first electrical field 4a, 0 - 10 spm in the second electrical field 4b, 0 spm in the third electri20 cal field 4c. Thus the second electrical field 4b and further electrical fields, if any, can be structured to include less electrical units 5 than the first electrical field 4a without jeopardizing the effectiveness of the filtering process carried out by the electrostatic precipitator 100. An advantage of this kind of electrostatic precipitator 100 is that the construct of the precipitator 100 is to set two 25 power supplier with control units for 5a and 5b. By doing this way amount of spm per control unit is only half than in the traditional solution. That is why control units can reach higher performance level than the traditional solution.
Figure 3a is a schematic top view of another electrostatic precipitator according to the invention, and Figure 3b a schematic perspective view of 30 the electrostatic precipitator shown in Figure 3a. It is to be noted here that dimensions of the electrostatic precipitator 100 may vary from those shown in Figures.
The structure of the electrostatic precipitator 100 is basically same as in Figures 2a, 2b. However, the electrostatic precipitator 100 shown in Fig35 ures 3a, 3b comprises two parallel structures 6a, 6b separated by a gas-tight division wall 7. The electrostatic precipitator 100 is thus divided into two inde pendently working gas passages 3a, 3b. Each of the passages 3a, 3b comprises similar structure of electrical fields and electrical units as discussed above in connection with Figures 2a, 2b.
The embodiment shown in Figures 3a, 3b is especially useful in 5 electrostatic precipitators 100 having very large dimensions.
It is to be noted, that the electrostatic precipitator 100 may be divided to three, or even more, parallel structures.
The electrostatic precipitators 100 according to the invention may be applied to variety of purification tasks. In an embodiment, the electrostatic pre10 cipitator 100 is used for removing particulates from flue gas of a kraft recovery boiler. In an embodiment, the electrostatic precipitator 100 is used for removing particulates from flue gas of a chemical recovery boiler.
The invention is not limited solely to the embodiments described above, but instead many variations are possible within the scope of the in15 ventive concept defined by the claims below. Within the scope of the inventive concept the attributes of different embodiments and applications can be used in conjunction with or replace the attributes of another embodiment or application.
The drawings and the related description are only intended to illus20 trate the idea of the invention. The invention may vary in detail within the scope of the inventive idea defined in the following claims.
20166023 prh 12 -03- 2019
Reference symbols
20166023 prh 12 -03- 2019
3, 3a, b
4a, b, c
5, 5a, b
6a, 6b
100 discharge electrode collecting electrode gas passage electrical field electrical unit parallel structure division wall electrostatic precipitator
G gas flow
20166023 prh 12 -03- 2019
Claims

Claims (5)

20166023 prh 12 -03- 201920166023 prh 12 -03- 2019 PatenttivaatimuksetThe claims 1. Sähkösuodatin hiukkasten poistamiseksi kattilan palokaasusta, joka sähkösuodatin käsittääAn electric filter for removing particles from the boiler flue gas comprising an electric filter 5 poistoelektrodeja ja keräyselektrodeja, jotka on asennettu kaasukanavaan, jotka mainitut elektrodit on järjestetty ainakin kahteen sähkökenttään, jotka on sijoitettu peräkkäin kaasuvirran suhteen joka sähkökenttä muodostaa ainakin yhden sähköyksikön mainitun5 discharge electrodes and collection electrodes mounted in a gas duct, said electrodes arranged in at least two electric fields arranged in a row relative to the gas stream each electric field forming at least one electrical unit 10 kaasukanavan poikittaissuunnassa, joka sähköyksikkö muodostaa osuuden sähkösuodattimesta ja josta voidaan poistaa jännite itsenäisesti, erikseen muista sähkösuodattimen sähköyksiköistä, joka ensimmäinen sähkökenttä mainituista ainakin kahdesta sähkö15 kentästä on järjestetty olemaan ensimmäinen mainitussa kaasuvirrassa, tunnettu siitä, että ensimmäinen sähkökenttä käsittää useampia sähköyksiköitä kuin toinen, ensimmäisen kentän jälkeen oleva toinen kenttä.The first electric field of said at least two electric fields 15 being arranged to be the first in said gas stream, characterized in that the first electric field comprises more than a second electric field, second field after. 2020 2. Patenttivaatimuksen 1 mukainen sähkösuodatin, tunnettu siitä, että ensimmäinen sähkökenttä käsittää kaksi sähköyksikköä ja toinen sähkökenttä käsittää yhden ja vain yhden sähköyksikön.Electric filter according to Claim 1, characterized in that the first electric field comprises two electric units and the second electric field comprises one and only one electric unit. 3. Patenttivaatimuksen 1 tai 2 mukainen sähkösuodatin, tunnet-An electric filter according to claim 1 or 2, 25 t u siitä, että toisen sähkökentän jälkeen on järjestetty lisäsähkökenttä / lisäsähkökenttiä, josta / joista lisäsähkökentästä / lisäsähkökentistä jokainen käsittää saman määrän sähköyksiköitä kuin toinen sähkökenttä.25 characterized in that an additional electric field (s) is provided after the second electric field, each of which additional electric field (s) comprises the same number of electric units as the other electric field. 4. Patenttivaatimuksen 3 mukainen sähkösuodatin, tunnettu sii-An electric filter according to claim 3, characterized by 30 tä, että sähkökenttien määrä on 2-8.30 that the number of electric fields is 2-8. 5. Jonkin edellisen patenttivaatimuksen mukaisen sähkösuodattimen käyttö hiukkasten poistamiseen soodakattilan palokaasusta.Use of an electric filter according to any one of the preceding claims for removing particles from the combustion gas of a recovery boiler. 35 6. Jonkin edellisen patenttivaatimuksen mukaisen sähkösuodattimen käyttö hiukkasten poistamiseen kemiallisen soodakattilan palokaasusta.Use of an electric filter according to any one of the preceding claims for removing particles from the combustion gas of a chemical recovery boiler.
FI20166023A 2016-12-22 2016-12-22 Electrostatic precipitator and its use FI127864B (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
FI20166023A FI127864B (en) 2016-12-22 2016-12-22 Electrostatic precipitator and its use
CA2985468A CA2985468C (en) 2016-12-22 2017-11-14 Method and arrangement
BR102017025478-0A BR102017025478B1 (en) 2016-12-22 2017-11-28 ELECTROSTATIC PRECIPITATOR TO REMOVE PARTICLES FROM BOILER FLUE GAS
US15/842,439 US10751729B2 (en) 2016-12-22 2017-12-14 Electrostatic precipitor
CL2017003265A CL2017003265A1 (en) 2016-12-22 2017-12-19 An electrostatic precipitator to extract particles from the combustion gas of boilers.
CN201711385219.8A CN108212536A (en) 2016-12-22 2017-12-20 Method and apparatus
EP17209811.3A EP3338894A1 (en) 2016-12-22 2017-12-21 Method and arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20166023A FI127864B (en) 2016-12-22 2016-12-22 Electrostatic precipitator and its use

Publications (2)

Publication Number Publication Date
FI20166023L FI20166023L (en) 2018-06-23
FI127864B true FI127864B (en) 2019-04-15

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Country Link
US (1) US10751729B2 (en)
EP (1) EP3338894A1 (en)
CN (1) CN108212536A (en)
BR (1) BR102017025478B1 (en)
CA (1) CA2985468C (en)
CL (1) CL2017003265A1 (en)
FI (1) FI127864B (en)

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FI127864B (en) 2016-12-22 2019-04-15 Valmet Technologies Oy Electrostatic precipitator and its use
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CA2985468C (en) 2019-09-24
CL2017003265A1 (en) 2018-06-22
EP3338894A1 (en) 2018-06-27
BR102017025478A2 (en) 2018-07-17
FI20166023L (en) 2018-06-23
CN108212536A (en) 2018-06-29
BR102017025478B1 (en) 2023-05-16
US10751729B2 (en) 2020-08-25
US20180178222A1 (en) 2018-06-28

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